The director of the company has elected not to include a copy of the income statement within the financial statements.true

These financial statements have been prepared and delivered in accordance with the provisions applicable to companies subject to the small companies regime.

Meso Scale UK Ltd is a private company limited by shares incorporated in England and Wales. The registered office is 2 New Street Square, London, EC4A 3BZ.

These financial statements have been prepared in accordance with FRS 102 “The Financial Reporting

Standard applicable in the UK and Republic of Ireland” (“FRS 102”) and the requirements of the Companies Act 2006 as applicable to companies subject to the small companies regime. The disclosure requirements of section 1A of FRS 102 have been applied.

The financial statements are prepared in US dollars, which is the functional currency of the company. Monetary amounts in these financial statements are rounded to the nearest $.

The financial statements have been prepared under the historical cost convention. The principal accounting policies adopted are set out below.

Atruet the time of approving the financial statements, the director has a reasonable expectation that the company has adequate resources to continue in operational existence for the foreseeable future. The entity is dependent on the parent company, Meso Scale Discovery Inc, for its continued business given all turnover is generated from within the group. The director has received an undertaking from Meso Scale Diagnostics LLC (ultimate parent company) that it will continue to make available such funds as are necessary to enable it to meet its liabilities as they fall due for a period of at least 12 months from approval of these financial statements. Thus the director continues to adopt the going concern basis of accounting in preparing the financial statements.

Turnover is recognised at the fair value of the consideration received or receivable for support services provided in the normal course of business, and is shown net of VAT and other sales related taxes.

The entirety of turnover is made up of support service fees receivable from the parent company, Meso Scale Discovery Inc (registered in the United States).

All turnover is derived from the company's principal activity out of offices in the UK for the parent company.

Cash and cash equivalents are basic financial assets and include cash in hand, deposits held at call with banks, other short-term liquid investments with original maturities of three months or less, and bank overdrafts.

The company has elected to apply the provisions of Section 11 ‘Basic Financial Instruments’ and Section 12 ‘Other Financial Instruments Issues’ of FRS 102 to all of its financial instruments.

Financial instruments are recognised in the company's statement of financial position when the company becomes party to the contractual provisions of the instrument.

Financial assets and liabilities are offset, with the net amounts presented in the financial statements, when there is a legally enforceable right to set off the recognised amounts and there is an intention to settle on a net basis or to realise the asset and settle the liability simultaneously.

Basic financial assets, which include amounts owed by group undertakings, other debtors, and cash and bank balances, are initially measured at transaction price including transaction costs and are subsequently carried at amortised cost using the effective interest method unless the arrangement constitutes a financing transaction, where the transaction is measured at the present value of the future receipts discounted at a market rate of interest. Financial assets classified as receivable within one year are not amortised.

Financial assets, other than those held at fair value through profit and loss, are assessed for indicators of impairment at each reporting end date.

Financial assets are impaired where there is objective evidence that, as a result of one or more events that occurred after the initial recognition of the financial asset, the estimated future cash flows have been affected. If an asset is impaired, the impairment loss is the difference between the carrying amount and the present value of the estimated cash flows discounted at the asset’s original effective interest rate. The impairment loss is recognised in profit or loss.

If there is a decrease in the impairment loss arising from an event occurring after the impairment was recognised, the impairment is reversed. The reversal is such that the current carrying amount does not exceed what the carrying amount would have been, had the impairment not previously been recognised. The impairment reversal is recognised in profit or loss.

Financial liabilities and equity instruments are classified according to the substance of the contractual arrangements entered into. An equity instrument is any contract that evidences a residual interest in the assets of the company after deducting all of its liabilities.

Basic financial liabilities, including amounts owed to group undertakings, and trade and other payables, are initially recognised at transaction price unless the arrangement constitutes a financing transaction, where the debt instrument is measured at the present value of the future payments discounted at a market rate of interest. Financial liabilities classified as payable within one year are not amortised.

Financial liabilities are derecognised when the company’s contractual obligations expire or are discharged or cancelled.

Equity instruments issued by the company are recorded at the proceeds received, net of transaction costs. Dividends payable on equity instruments are recognised as liabilities once they are no longer at the discretion of the company.

The tax expense represents the sum of the tax currently payable and deferred tax.

The tax currently payable is based on taxable profit for the year. Taxable profit differs from net profit as reported in the income statement because it excludes items of income or expense that are taxable or deductible in other years and it further excludes items that are never taxable or deductible. The company’s liability for current tax is calculated using tax rates that have been enacted or substantively enacted by the reporting end date.

Deferred tax liabilities are generally recognised for all timing differences and deferred tax assets are recognised to the extent that it is probable that they will be recovered against the reversal of deferred tax liabilities or other future taxable profits. Such assets and liabilities are not recognised if the timing difference arises from goodwill or from the initial recognition of other assets and liabilities in a transaction that affects neither the tax profit nor the accounting profit.

The carrying amount of deferred tax assets is reviewed at each reporting end date and reduced to the extent that it is no longer probable that sufficient taxable profits will be available to allow all or part of the asset to be recovered. Deferred tax is calculated at the tax rates that are expected to apply in the period when the liability is settled or the asset is realised. Deferred tax is charged or credited in the income statement, except when it relates to items charged or credited directly to equity, in which case the deferred tax is also dealt with in equity. Deferred tax assets and liabilities are offset when the company has a legally enforceable right to offset current tax assets and liabilities and the deferred tax assets and liabilities relate to taxes levied by the same tax authority.

The costs of short-term employee benefits are recognised as a liability and an expense, unless those costs are required to be recognised as part of the cost of stock or non-current assets.

The cost of any unused holiday entitlement is recognised in the period in which the employee’s services are received.

Termination benefits are recognised immediately as an expense when the company is demonstrably committed to terminate the employment of an employee or to provide termination benefits.

Payments to defined contribution retirement benefit schemes are charged as an expense as they fall due.

Transactions in currencies other than US dollars are recorded at the rates of exchange prevailing at the dates of the transactions. At each reporting end date, monetary assets and liabilities that are denominated in foreign currencies are retranslated at the rates prevailing on the reporting end date. Gains and losses arising on translation in the period are included in profit or loss.

The average monthly number of persons (including directors) employed by the company during the year was:

Amounts owed by group undertakings are interest free and repayable on demand.

Amounts owed to group undertakings are interest free and repayable on demand.

As the income statement has been omitted from the filing copy of the financial statements, the following information in relation to the audit report on the statutory financial statements is provided in accordance with s444(5B) of the Companies Act 2006.

The auditor's report is unqualified and includes the following:

In our opinion the financial statements:

• give a true and fair view of the state of the company's affairs as at 31 December 2024 and of its profit for the year then ended;

• have been properly prepared in accordance with United Kingdom Generally Accepted Accounting Practice; and

• have been prepared in accordance with the requirements of the Companies Act 2006.

The Company has taken the exemption, under section 1AC.35 of the Financial Reporting Standard 102, not to disclose related party transactions with wholly owned subsidiaries within the Group.

The immediate parent company is Meso Scale Discovery, Inc., a company incorporated in the USA, with a registered office address of 1601 Research Boulevard, Rockville, Maryland 20850-317, USA.

The ultimate parent company is Meso Scale Diagnostics LLC., a company incorporated in the USA, with a registered office address of 1601 Research Boulevard, Rockville, Maryland 20850-317, USA. This is the parent to the largest group to which consolidated financial statements are prepared for and copies of these can be obtained from the registered office address given.

The ultimate controlling party is the director J Wohlstadter.